Woodworking tool fence supporting structure



Nov. 13, 1951 copp 2,575,250

WOODWORKING TOOL. FENCEYSUPPORTING STRUCTURE Filed Oct. 16, 1948 4Sheets-Sheet l INVE N TOR MILL/AM COP}? NOV, 13, 1951 (:QPP 2,575,250

WOODWORKING TOOL FENCE SUPPORTING STRUCTURE Filed Oct. 16, 1948 4ShtS-Sht 2 //V VE N TOR W/LU/IM COPP Nov. 13, 1951 w CQPP 2,575,250

WOODWORKING TOOL FENCE SUPPORTING STRUCTURE Filed Oct 16, 1948 4Sheets-Sheet 5 I N VE N TOR WILL/A M C OPP Nov. 13, 1951 w. coPPWOODWORKING TOOL FENCE SUPPORTING STRUCTURE 4 Sheets-Sheet 4 Filed Oct.16, 1948 mvm/rm WILL/14M CORP HTTX Patented Nov. 13, 1951 WOODWORKINGTOOL FENCE SUPPORTING STRUCTURE 7 William Copp, Guelph, Ontario, Canada,assignor to Callender Foundry & Manufacturing 00., Limited, Guelph,Ontario, Canada, acorporation of Canada Application October 16, 1948,Serial No. 54,909 6 Claims. (01. 144-253) The present invention relatesto woodworking tools, and is particularly concerned with improvements ina fence supporting structure for jointers.

It is an object of this invention to provide a J'ointer fence which ismounted in such a manner that the lower edge of the fence will be closeto the rear table of the jointer, irrespective of the relative raisingor lowering of the front table of the jointer, thereby insuring propersupport for the work as it passes over the rear table.

Another object of the invention is the provision of an improved fencefor jointers and of an improved mode of support for the fence whereby itmay be firmly and rigidly held in any angular position and at differentdistances from the cutter.

A still further object of the invention is the provision of an improvedsupport for a work fence for a jointer or similar tool which is sturdy,capable of economical manufacture, and simple, so that adjustments maybe made quickly and the fence quickly secured in any desired position.

All of the foregoing and still further objects and advantages of theinvention will become apparent from a study of thefollowing'specification, taken in conjunction with the accompanyingdrawings, wherein like characters of reference designate correspondingparts throughout the several views, in which Fig. 1 is a frontperspective View of a jointer constructed in accordance with thisinvention;

Fig. 2 is a rear perspective view of the said jointer, showingparticularly the fence mounting means;

Fig. 3 is a rear elevation of the fence mounting means;

Fig. 4 is a top plan view of the fence mounting means;

Fig. 5 is a vertical sectional view of the fence mounting means, takenon the plane of the line 5-5 of Fig. 3, looking in the direction of thearrows;

Fig. 6 is a fragmentary vertical elevational view of the fence mountingmeans, showing particularly the links in the position which they assumewhen the fence is vertical; and

Fig. 7 is a fragmentary vertical elevational view of the fence mountingmeans, showing the links in a position which they assume when the fenceis in a tilted position.

Referring to the drawings, l0 designates a jointer base having bearingsin which is journalled a cutter-head ll driven in any suitable manner. Afront table l2 and a rear table l3 are slidably mounted ontheusual-inclined ways I4 and 15 formed on the base Ill, so as to becapable of raising and lowering with respect to the cutter-head. Thetables are independently movable by means of any suitable adjustingmeans,' here shown to include adjusting knobs l6 and ll. The front table[2 is formed at one side with a rabbeting arm or ledge 18, and the reartable I3 is formed at the same side with a grooved edge [9 to provideclearance for rabbeted work.

Extending from the back of the rear table l3 are two parallel fencesupporting rods 20 and ill, on which is mounted the fence supportingfixture generally indicated at 22. The fence supporting .fixturepreferably comprises a casting having two spaced arms 23 and 24 (Fig.4), the lower ends of the said arms being provided With boredenlargements 25 and 26, which are slidably mounted on supporting rods 20and 2| respectively. A locking handle assembly 21 is provided to preventundesired sliding movement of the fence supporting fixture on the rods.

In the arms 23 and 24 are provided bearings 28 and 29 respectively (Fig.3), and in the said bearings is journalled a control member for rotationon an axis parallel to the table; The control member comprises ahollowcylinder 30 at the outer end of which are secured cover plates 31 and 32by means of lugs 33 and 34 which form an integral part of the coverplates; they extend inside the cylinder and are secured thereto by meansof suitable screws. The diameter of the cover plates is somewhat greaterthan the diameter of the cylinder 30; therefore the cover plates bearagainst the side-arms 23 and 24 respectively, and'axial movement of thecontrol means is prevented thereby. Secured to the cylinder andextending radially therefrom is an adjusting handle 35; it is clear thatthe control means may be rotated in the bearings by grasping handle 35and moving it in the desired direction.

On the rear face of fence 36 is secured asupporting bar 31 by means ofscrews 38. To one end of supporting bar 38 are pivotally connected oneend of a pair of crossed links 39 and 40, the other ends of the saidlinks being pivotally connected to the cover plate 3|. Similarly, to theother end of supporting bar 38 are pivotally connected one end of a pairof crossed links 4| and 42, the other ends of the said links beingpivotally connected to the cover plate 32.

Since the construction of the two pairs of crossed links and also theirpivotal connections to the fence and to the cover plates are identical,

only one pair of crossed-Jinks will be described in detail; reference ismade particularly to Figures 6 and 7, in which are shown links 39 and 40pivotally connected at one end to the fence by means of screws 43 and44, and at the other end to the cover plate 3| by means of screws 45 and46. It will 'benoted that link 40 is provided with anelongatedlarcuateslot 41, whereas link 39 is provided with an arouateslot 48 of relatively small radius. These slots provide a pair ofinter-::

secting cam-profiles, and through them (as through the correspondingslots-in the other pair. of links 4| and 42) passes a pin or rod 49-,which i also extends through openingsprovideduiri the arms 23 and 24 ofthe fencelsupportinglfixturez 22. Moreover. it is obviously "necessaryfrom' a construction standpoint that the rod 49 extend through the coverplates 3| and 32, and there-;

fore arcuate apertures 50 are provided therein.

At one end of the rod 49 is a locknu't assembl-y'5l whereas at the otherend is a cam lock handle 52.

A study of Figures 6 and '7 will reveal that the relative dimensions ofthe links, the locations of theirpivotal connectionson the fence 35 andon the cover plate 35, the cam-profile configurations of the slots 4'!and 4S, and the location of rod 49 are: such that the lower edge of thefence moves in a plane substantially parallel to the plane of the tablewhen the control member isrotated.

To adjust the fence to the desired angle, it is merely necessary 'torelease locking handle 52,

and by'gripping handle 35 the operator may turn rangement of parts'maybe resorted to, without departing from the spirit of the invention orthe scope of the subjoined claims.

What I'claimas my invention is:

1. In a machine tool having a table, means to tiltably mount a fence onthe table. comprising a fencesupporting fixture secured to the table, acontrol. member mounted on the fixture for rotation about anaxis'parallel to the table, a pair of links connecting the fence to thecontrol member, one linkhaving an end connected to the upper part of thefence and the other end connected to the lower part of the controlsmember, the other linkihavingzanend connected to the lower part ofthe'fence and the other end connected to theupper part of the controlmember, the said links thereby.crossingpeach other, and guide meanssecured to the fixture, each link having an arouate cam-profile slidablysupported by the guide means for all the:relative positions of the linksproduced byrotation of the control member, the said cam-profilesintersecting and the guide means defining the point of intersectionwhereby when the control member is rotated the fence is tiltedin .a pathpredetermined by the configuration of the said cam-profiles with respectto the locations of the connections of the links to thecontrol memberandthe location of the guide means;

2. In a machine tool having a table, means to tiltably mount a fence onthe table comprising a fence supporting fixture secured to the table, acontrol member mounted on the fixture for rotation about an axisparallel to the table, a pairof crossed links connecting the fence tothe control member, each one of the said links having one end pivotallyconnected to the fence and the other end pivotally connected to thecontrol memher, an arcuate slot in each link crossing the slot in theother link,-the slots providing a pair of intersecting cam-profiles,.-aapin on the fixture extending through both the slots and defining thepoint of intersection of the cam-profiles for all the relative positionsof the links produced by rotation of the control member, thecam-profiles in the links slidably engaging the said pin andthe fencethus "being tiltable when the controlrimeansuis rotated only in a pathpredetermined by the configuration of cam-profiles provided by thetwo-arcuate slots with respect to thelocations of the. pivotalconnections of the links and the location of the rod.

3. In "a-machine tool having a table, means to tiltably mount a fenceon" the table comprising a fence supporting fixture secured to'thetable, a control member mounted on thefixture for rotatation about anaxisparallel to the table, a pair of linksconnecting thefence to thecontrol member, one link having an end connected to-the upper part ofthe fence and the other'end connected--to the lower part of the controlmember, the other-link having an end: connected to the lower part of thefence and the other-end connected to theu-pper part'of the controlmember, the said links thereby crossing each other,'a pin on thefixture, an arcuate slot in the first mentioned link, throughwhichpasses the pin, an

arcuate slot in the second mentioned link through I which also passesthe pin-,the said slots cross ing each other and providing a pair ofintersect-.

ing earn-profiles and'the pin defining the point of intersection'oithecam-profilesfor all therelative positions of the linksproduced layrotation of the control membergathe said slots-also being ofsubstantially':the same width-asthe diameter. of the pin, the engagementof the pin with the I cam profiles guiding the movement of the linksand'the location of the pinbeing such that when the control membcrisrotated :the :lower edge of the fence moves in aplanesubstantiallyparallel to the plane of the table.z--

4. In a machine tool-having a table, meansto tilt-ably mount a fence onthe table comprising-.- a fence supporting fixture secured to the table;a

control member mounted on thefixture for rotation about an axis parallelto the table, a pain of crossed links connecting the fence to thecontrol member, each one of the said links having oneend'pivotallyconnectedito the fence and the other endpivotallysconnected to the control member, an arcuate slot in eachlink-,theslotscrossing each other and providing a pair of inter-F.secting cam-profileaa pin on thefixtureextending through. both:theslots, and defining .thepoint of intersection of the cam-profilesforall-the1re1+ ative positions of the links produced by-rotation ofthecontrol member,- the cam profiles slidably engaging the said pin andthe fence thusbeing tiltable when the control means :is rotated. only;in a path predetermined by (the: configuration ofthe two cam-profileswith respect to the locaprevent undesired movement of the fence andadapted when in another position to allow the links to move therebypermitting adjustment of the tilt of the fence.

5. In a machine tool having a table, means to tiltably mount a fence onthe table comprising a fence supporting fixture secured to the table andhaving spaced arms provided with bearings, a control member journalledin the said bearings for rotation about an axis parallel to the table, apair of crossed links at each end of the control member connecting thefence thereto, each link having an end pivotally connected to the fenceand the other end pivotally connected to the control member, an arcuateslot in each link, the slots in each pair of links crossing each otherand providing a pair of intersecting cam-profiles, a rod extendingthrough fixed points in the two arms and through both slots in each pairof links and defining the points of intersection of the cam-profiles forall the relative positions of the links produced by rotation of thecontrol member, the cam profiles slidably engaging the said rod and thefence thus being tiltable when the control means is rotated only in apath predetermined by the configuration of the camprofiles with respectto the locations of the pivotal connections of the links and thelocation of the rod.

6. In a machine tool having a table, means to tiltably mount a fence ofthe table comprising a fence supporting fixture secured to the table andhaving spaced arms provided with bearings, a control member journalledin the said bearings for rotation about an axis parallel to the table,cover plates secured to the ends of the control member, the diameter ofthe said cover plates being greater than the diameter of the bearingsand the cover plates thus preventing axial displacement of the controlmember in the fixture, an arcuate aperture in each cover plate, a pairof crossed links at each end of the control member connecting the fencethereto, each link having an end pivotally connected to the fence, theother ends of the links of one pair being pivotally connected to one ofthe cover plates and the other ends of the links of the other pair beingpivotally connected to the other cover plate, an arcuate slot 1 in eachlink, the slots in each pair of links crossing each other and providinga pair of intersecting cam-profiles, a rod extending through fixedpoints in the two arms, through the apertures in the cover plates andthrough both slots in each pair of links and defining the points ofintersection of the cam-profiles for all the relative positions of thelinks produced by rotation of the control member, the cam-profilesslidably engaging the said rod and the fence thus being tiltable only ina path predetermined by the configuration of the two arcuate slots ineach pair of links with respect to the locations of the pivotalconnections of the links and the location of the rod.

WILLIAM COPP.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 264,421 Sweet Sept. 12, 18822,123,627 Hedgpeth July 12, 1938 2,264,527 Hawkins Dec. 2, 1941 FOREIGNPATENTS Number Country Date 469,671 France May 26, 1914

